The company said it was a protective measure to prevent older devices being damaged by power spikes inside the battery.

The cost of a battery replacement outside warranty was A$119.

On December 29 last year, however, Apple apologised for its handling of the issue and said it would drop the price of battery replacements from $119 to $39 in Australia - with similar price reductions worldwide - until the end of 2018.

The $80 credit announced today means that Australian users that paid full price last year are no worse off than those who put up with device performance issues.

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